Question 1

Which rate law is ternary?

Accepted Answer

A) rate = k[A][B]2 
B) rate = k [A][B] 
C) rate = k [A] 
D) rate = k [A][B][C][D] 
E) rate = k [A]2 
A) rate = k[A][B]2 
B) rate = k [A][B] 
C) rate = k [A] 
D) rate = k [A][B][C][D] 
E) rate = k [A]2 A

Question 2

Which of the following reactions would you predict to have the largest orientation factor?

Accepted Answer

A) NOF(g)+ NOF(g)→ 2NO(g)+ F2(g) 
B) Br2(g)+ H2C=CH2(g)→ H2BrC-CBrH2(g) 
C) NH3(g)+ BCl3(g)→ H3N-BCl3(g) 
D) H(g)+ Cl(g)→ HCl(g) 
E) All of these reactions should have nearly identical orientation factors. 
A) NOF(g)+ NOF(g)→ 2NO(g)+ F2(g) 
B) Br2(g)+ H2C=CH2(g)→ H2BrC-CBrH2(g) 
C) NH3(g)+ BCl3(g)→ H3N-BCl3(g) 
D) H(g)+ Cl(g)→ HCl(g) 
E) All of these reactions should have nearly identical orientation factors. D

Question 3

The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10-4 s-1.If the initial concentration of cyclopropane is 1.33 M,what is the concentration of cyclopropane after 644 s?

Accepted Answer

A) 0.43 M 
B) 0.15 M 
C) 0.94 M 
D) 0.86 M 
E) 0.67 M 
A) 0.43 M 
B) 0.15 M 
C) 0.94 M 
D) 0.86 M 
E) 0.67 M D

Question 4

Which of the following statements is false?

Accepted Answer

A) The average rate of a reaction decreases during a reaction. 
B) It is not possible to determine the rate of a reaction from its balanced equation. 
C) The rate of zero order reactions is not dependent on concentration. 
D) The half-life of a first order reaction is dependent on the initial concentration of reactant. 
E) None of the statements are false. 
A) The average rate of a reaction decreases during a reaction. 
B) It is not possible to determine the rate of a reaction from its balanced equation. 
C) The rate of zero order reactions is not dependent on concentration. 
D) The half-life of a first order reaction is dependent on the initial concentration of reactant. 
E) None of the statements are false.

Question 5

Write a balanced reaction for which the following rate relationships are true.
Rate =    =  = -

Accepted Answer

A)   N2 + O2 →  N2O 
B) 2 N2O → 2 N2 + O2 
C) N2O → N2 + 2 O2 
D)   N2O → N2 + O2 
E) 2 N2 + O2 → 2 N2O 
A)   N2 + O2 →  N2O 
B) 2 N2O → 2 N2 + O2 
C) N2O → N2 + 2 O2 
D)   N2O → N2 + O2 
E) 2 N2 + O2 → 2 N2O

Question 6

The decomposition of dinitrogen pentoxide is described by the chemical equation:
2 N2O5(g)→ 4 NO2(g)+ O2(g)
If the rate of appearance of O2 is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

Accepted Answer

A) 0.750 mol/min 
B) 1.50 mol/min 
C) 6.00 mol/min 
D) 12.0 mol/min 
A) 0.750 mol/min 
B) 1.50 mol/min 
C) 6.00 mol/min 
D) 12.0 mol/min

Question 7

A reaction is found to have an activation energy of 38.0 kJ/mol.If the rate constant for this reaction is 1.60 × 102 M-1s-1 at 249 K,what is the rate constant at 436 K?

Accepted Answer

A) 2.38 × 105 M-1s-1 
B) 1.26 × 103 M-1s-1 
C) 7.94 × 104 M-1s-1 
D) 4.20 × 105 M-1s-1 
E) 3.80 × 104 M-1s-1 
A) 2.38 × 105 M-1s-1 
B) 1.26 × 103 M-1s-1 
C) 7.94 × 104 M-1s-1 
D) 4.20 × 105 M-1s-1 
E) 3.80 × 104 M-1s-1

Question 8

The rate of disappearance of HBr in the gas phase reaction
2HBr(g)→ H2(g)+ Br2(g)
Is 0.130 M s-1 at 150°C.The rate of reaction is ________ M s-1.

Accepted Answer

A) 3.85 
B) 0.0650 
C) 0.0169 
D) 0.260 
E) 0.0860 
A) 3.85 
B) 0.0650 
C) 0.0169 
D) 0.260 
E) 0.0860

Question 9

The isomerization of methylisonitrile to acetonitrile
CH3NC(g)→ CH3CN(g)
Is first order in CH3NC.The rate constant for the reaction is 4.76 × 10-4 s-1 at 498 K.The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s.

Accepted Answer

A) 2.10 × 103 
B) 1.05 × 103 
C) 7.00 × 104 
D) 1.46 × 103 
E) 6.87 × 10-4 
A) 2.10 × 103 
B) 1.05 × 103 
C) 7.00 × 104 
D) 1.46 × 103 
E) 6.87 × 10-4

Question 10

The first-order rearrangement of CH3NC is measured to have a rate constant of 3.61 × 10-15 s-1 at 298 K and a rate constant of 8.66 × 10-7 s-1 at 425 K.Determine the activation energy for this reaction.

Accepted Answer

A) 160.kJ/mol 
B) 240.kJ/mol 
C) 417 kJ/mol 
D) 127 kJ/mol 
E) 338 kJ/mol 
A) 160.kJ/mol 
B) 240.kJ/mol 
C) 417 kJ/mol 
D) 127 kJ/mol 
E) 338 kJ/mol

Question 11

Give the characteristic of a first order reaction having only one reactant.

Accepted Answer

A) The rate of the reaction is not proportional to the concentration of the reactant. 
B) The rate of the reaction is proportional to the square of the concentration of the reactant. 
C) The rate of the reaction is proportional to the square root of the concentration of the reactant. 
D) The rate of the reaction is proportional to the natural logarithm of the concentration of the reactant. 
E) The rate of the reaction is directly proportional to the concentration of the reactant. 
A) The rate of the reaction is not proportional to the concentration of the reactant. 
B) The rate of the reaction is proportional to the square of the concentration of the reactant. 
C) The rate of the reaction is proportional to the square root of the concentration of the reactant. 
D) The rate of the reaction is proportional to the natural logarithm of the concentration of the reactant. 
E) The rate of the reaction is directly proportional to the concentration of the reactant.

Question 12

The isomerization reaction,CH3NC → CH3CN,is first order and the rate constant is equal to 0.46 s-1 at 600 K.What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.30 M?

Accepted Answer

A) 1.2 × 10-3 M 
B) 2.7 × 10-3 M 
C) 1.2 × 10-1 M 
D) 2.7 × 10-1 M 
A) 1.2 × 10-3 M 
B) 2.7 × 10-3 M 
C) 1.2 × 10-1 M 
D) 2.7 × 10-1 M

Question 13

Given the following rate law,how does the rate of reaction change if the concentration of Y is doubled?
Rate = k [X][Y]

Accepted Answer

A) The rate of reaction will increase by a factor of 2. 
B) The rate of reaction will increase by a factor of 4. 
C) The rate of reaction will increase by a factor of 5. 
D) The rate of reaction will decrease by a factor of 2. 
E) The rate of reaction will remain unchanged. 
A) The rate of reaction will increase by a factor of 2. 
B) The rate of reaction will increase by a factor of 4. 
C) The rate of reaction will increase by a factor of 5. 
D) The rate of reaction will decrease by a factor of 2. 
E) The rate of reaction will remain unchanged.

Question 14

What is the overall order of the following reaction,given the rate law?
2NO(g)+ H2(g)→ N2(g)+ 2H2O(g)Rate = k[NO]2[H2]

Accepted Answer

A) 1st order 
B) 2nd order 
C) 3rd order 
D) 4th order 
E) 0th order 
A) 1st order 
B) 2nd order 
C) 3rd order 
D) 4th order 
E) 0th order

Question 15

The combustion of ethylene proceeds by the reaction
C2H4(g)+ 3O2(g)→ 2CO2(g)+ 2H2O(g)
When the rate of disappearance of O2 is 0.23 M s-1,the rate of disappearance of C2H4 is ________ M s-1.

Accepted Answer

A) 0.15 
B) 0.077 
C) 0.69 
D) 0.35 
E) 0.46 
A) 0.15 
B) 0.077 
C) 0.69 
D) 0.35 
E) 0.46

Question 16

What data should be plotted to show that experimental concentration data fits a first-order reaction?

Accepted Answer

A) 1/[reactant] vs.time 
B) [reactant] vs.time 
C) ln[reactant] vs.time 
D) ln(k)vs.1/T 
E) ln(k)vs.Ea 
A) 1/[reactant] vs.time 
B) [reactant] vs.time 
C) ln[reactant] vs.time 
D) ln(k)vs.1/T 
E) ln(k)vs.Ea

Question 17

What are the units of k in the following rate law?
Rate = k[X][Y]2

Accepted Answer

A)    
B)    
C) M2 s 
D)    
E)    
A)    
B)    
C) M2 s 
D)    
E)

Question 18

Nitrogen dioxide decomposes at 300°C via a second-order process to produce nitrogen monoxide and oxygen according to the following chemical equation.
2 NO2(g)→ 2 NO(g)+ O2(g).
A sample of NO2(g)is initially placed in a 2.50-L reaction vessel at 300°C.If the half-life and the rate constant at 300°C are 11 seconds and 0.54 M-1 s-1,respectively,how many moles of NO2 were in the original sample?

Accepted Answer

A) 0.17 mol 
B) 0.42 mol 
C) 5.9 mol 
D) 15 mol 
A) 0.17 mol 
B) 0.42 mol 
C) 5.9 mol 
D) 15 mol

Question 19

In aqueous solution,hypobromite ion,BrO-,reacts to produce bromate ion,BrO3-,and bromide ion,Br-,according to the following chemical equation.
3 BrO-(aq)→ BrO-(aq)+ 2 Br-(aq)
A plot of 1/[BrO-] vs.time is linear and the slope is equal to 0.056 M-1s-1.If the initial concentration of BrO- is 0.80 M,how long will it take one-half of the BrO- ion to react?

Accepted Answer

A) 4.5 × 10-2 s 
B) 7.1 s 
C) 12 s 
D) 22 s 
A) 4.5 × 10-2 s 
B) 7.1 s 
C) 12 s 
D) 22 s

Question 20

The decomposition of dinitrogen pentoxide is described by the chemical equation:
2 N2O5(g)→ 4 NO2(g)+ O2(g)
If the rate of appearance of NO2 is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O2 at that moment?

Accepted Answer

A) 0.140 mol/min 
B) 0.280 mol/min 
C) 1.12 mol/min 
D) 2.24 mol/min 
A) 0.140 mol/min 
B) 0.280 mol/min 
C) 1.12 mol/min 
D) 2.24 mol/min

Which rate law is ternary?

Which of the following reactions would you predict to have the largest orientation factor?

The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10^-4 s^-1.If the initial concentration of cyclopropane is 1.33 M,what is the concentration of cyclopropane after 644 s?

Which of the following statements is false?

Write a balanced reaction for which the following rate relationships are true. Rate = = = -

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of O₂ is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

A reaction is found to have an activation energy of 38.0 kJ/mol.If the rate constant for this reaction is 1.60 × 10² M^-1s^-1 at 249 K,what is the rate constant at 436 K?

The rate of disappearance of HBr in the gas phase reaction 2HBr(g)→ H₂(g)+ Br₂(g) Is 0.130 M s^-1 at 150°C.The rate of reaction is ________ M s^-1.

The isomerization of methylisonitrile to acetonitrile CH₃NC(g)→ CH₃CN(g) Is first order in CH₃NC.The rate constant for the reaction is 4.76 × 10^-4 s^-1 at 498 K.The half-life of the reaction when the initial [CH₃NC] is 0.030 M is ________ s.

The first-order rearrangement of CH₃NC is measured to have a rate constant of 3.61 × 10^-15 s^-1 at 298 K and a rate constant of 8.66 × 10^-7 s^-1 at 425 K.Determine the activation energy for this reaction.

Give the characteristic of a first order reaction having only one reactant.

The isomerization reaction,CH₃NC → CH₃CN,is first order and the rate constant is equal to 0.46 s^-1 at 600 K.What is the concentration of CH₃NC after 0.20 minutes if the initial concentration is 0.30 M?

Given the following rate law,how does the rate of reaction change if the concentration of Y is doubled? Rate = k [X][Y]

What is the overall order of the following reaction,given the rate law? 2NO(g)+ H₂(g)→ N₂(g)+ 2H₂O(g)Rate = k[NO]²[H₂]

The combustion of ethylene proceeds by the reaction C₂H₄(g)+ 3O₂(g)→ 2CO₂(g)+ 2H₂O(g) When the rate of disappearance of O₂ is 0.23 M s^-1,the rate of disappearance of C₂H₄ is ________ M s^-1.

What data should be plotted to show that experimental concentration data fits a first-order reaction?

What are the units of k in the following rate law? Rate = k[X][Y]²

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of NO₂ is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O₂ at that moment?

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Exam 13: Chemical Kinetics

Which rate law is ternary?

Which of the following reactions would you predict to have the largest orientation factor?

The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10-4 s-1.If the initial concentration of cyclopropane is 1.33 M,what is the concentration of cyclopropane after 644 s?

Which of the following statements is false?

Write a balanced reaction for which the following rate relationships are true. Rate = = = -

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N2O5(g)→ 4 NO2(g)+ O2(g) If the rate of appearance of O2 is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

A reaction is found to have an activation energy of 38.0 kJ/mol.If the rate constant for this reaction is 1.60 × 102 M-1s-1 at 249 K,what is the rate constant at 436 K?

The rate of disappearance of HBr in the gas phase reaction 2HBr(g)→ H2(g)+ Br2(g) Is 0.130 M s-1 at 150°C.The rate of reaction is ________ M s-1.

The isomerization of methylisonitrile to acetonitrile CH3NC(g)→ CH3CN(g) Is first order in CH3NC.The rate constant for the reaction is 4.76 × 10-4 s-1 at 498 K.The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s.

The first-order rearrangement of CH3NC is measured to have a rate constant of 3.61 × 10-15 s-1 at 298 K and a rate constant of 8.66 × 10-7 s-1 at 425 K.Determine the activation energy for this reaction.

Give the characteristic of a first order reaction having only one reactant.

The isomerization reaction,CH3NC → CH3CN,is first order and the rate constant is equal to 0.46 s-1 at 600 K.What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.30 M?

Given the following rate law,how does the rate of reaction change if the concentration of Y is doubled? Rate = k [X][Y]

What is the overall order of the following reaction,given the rate law? 2NO(g)+ H2(g)→ N2(g)+ 2H2O(g)Rate = k[NO]2[H2]

The combustion of ethylene proceeds by the reaction C2H4(g)+ 3O2(g)→ 2CO2(g)+ 2H2O(g) When the rate of disappearance of O2 is 0.23 M s-1,the rate of disappearance of C2H4 is ________ M s-1.

What data should be plotted to show that experimental concentration data fits a first-order reaction?

What are the units of k in the following rate law? Rate = k[X][Y]2

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N2O5(g)→ 4 NO2(g)+ O2(g) If the rate of appearance of NO2 is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O2 at that moment?

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

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The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10^-4 s^-1.If the initial concentration of cyclopropane is 1.33 M,what is the concentration of cyclopropane after 644 s?

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of O₂ is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

A reaction is found to have an activation energy of 38.0 kJ/mol.If the rate constant for this reaction is 1.60 × 10² M^-1s^-1 at 249 K,what is the rate constant at 436 K?

The rate of disappearance of HBr in the gas phase reaction 2HBr(g)→ H₂(g)+ Br₂(g) Is 0.130 M s^-1 at 150°C.The rate of reaction is ________ M s^-1.

The isomerization of methylisonitrile to acetonitrile CH₃NC(g)→ CH₃CN(g) Is first order in CH₃NC.The rate constant for the reaction is 4.76 × 10^-4 s^-1 at 498 K.The half-life of the reaction when the initial [CH₃NC] is 0.030 M is ________ s.

The first-order rearrangement of CH₃NC is measured to have a rate constant of 3.61 × 10^-15 s^-1 at 298 K and a rate constant of 8.66 × 10^-7 s^-1 at 425 K.Determine the activation energy for this reaction.

The isomerization reaction,CH₃NC → CH₃CN,is first order and the rate constant is equal to 0.46 s^-1 at 600 K.What is the concentration of CH₃NC after 0.20 minutes if the initial concentration is 0.30 M?

What is the overall order of the following reaction,given the rate law? 2NO(g)+ H₂(g)→ N₂(g)+ 2H₂O(g)Rate = k[NO]²[H₂]

The combustion of ethylene proceeds by the reaction C₂H₄(g)+ 3O₂(g)→ 2CO₂(g)+ 2H₂O(g) When the rate of disappearance of O₂ is 0.23 M s^-1,the rate of disappearance of C₂H₄ is ________ M s^-1.

What are the units of k in the following rate law? Rate = k[X][Y]²

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of NO₂ is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O₂ at that moment?